A Triathlon with Type 1 Diabetes

We’re always inspired by athletes achieving success while living with diabetes, and Lesley Edwards is no exception! Living with type 1 diabetes since age 10 and Medtronic Diabetes Clinical Manager, Lesley uses the MiniMed 530G with Enlite to manage her diabetes. While racing in her latest triathlon, her blood glucose dropped and the Threshold Suspend feature on her pump kicked in when it hit her preset low threshold. Read her experience using the feature and why she’s so grateful for the new integrated system.

I recently participated in the YMCA Sprint Triathlon in North Carolina, which includes a 750 meter swim, a 17 mile bike ride, and a 3.1 mile run. I love doing these races, but I do worry about my blood glucose levels, especially when I am in a competition and want to do better in every race. That’s why I’m really happy to have the Threshold Suspend feature on my MiniMed 530G pump. It automatically stops insulin delivery when my sensor glucose value reaches a preset low limit (mine is set to 60 mg/dL).


Before my swim, my blood sugar was 77 mg/dL, on both my blood glucose (BG) meter and my sensor.  I took off the pump for the swim (of course), but was able to put it on during the transition from swim to bike. During the transition, I quickly ate a granola bar, and put my pump on a temporary basal rate of 30%.


Being on the bike, it is hard to use your hands for much more than steering and breaking. However, I was able to use one hand while glancing down at my pump to see what my sensor glucose was doing. About three quarters through my bike ride, I heard an alarm. I glanced down at my pump: Threshold Suspend. I pulled over, checked my blood sugar, and it was indeed 62 mg/dL. I treated the low, but let the pump keep my basal suspended (Threshold Suspend lasts two hours unless you manually resume it) and got back into my ride. After my ride, I had a blood sugar of 91 mg/dL.


I still had a run to do, so I continued to let my pump keep my basal suspended.  My regular basal resumed during my run, but I was confident that if I dropped low again while running, the sensor would catch it. At the end of my run I was 120 mg/dL. Even with a two hour suspend, I never dropped below 62 mg/dL or rose above 120 mg/dL the whole race!

I have worn the Medtronic pump since 1997 and have had nothing but success with my pump, but this experience was the best. I am so grateful to have this integrated system with the Threshold Suspend feature so I can continue living the life I want to live. With MiniMed 530G with Enlite, I can be ME at my full potential!

Important Safety Information

Medtronic Diabetes insulin infusion pumps, continuous glucose monitoring systems and associated components are limited to sale by or on the order of a physician and should only be used under the direction of a healthcare professional familiar with the risks associated with the use of these systems. MiniMed 530G with Enlite is intended for the delivery of insulin and continuous glucose monitoring for the management of diabetes mellitus by persons 16 years of age or older who require insulin.

Pump therapy is not recommended for people who are unwilling or unable to perform a minimum of four blood glucose tests per day. Insulin pumps use rapid-acting insulin. If your insulin delivery is interrupted for any reason, you must be prepared to replace the missed insulin immediately.

The information provided by CGM systems is intended to supplement, not replace, blood glucose information obtained using a home glucose meter. A confirmatory fingerstick is required prior to making adjustments to diabetes therapy. MiniMed 530G with Enlite is not intended to be used directly for preventing or treating hypoglycemia but to suspend insulin delivery when the user is unable to respond to the Threshold Suspend alarm and take measures to prevent or treat hypoglycemia themselves.

WARNING: The Threshold Suspend feature will cause the pump to temporarily suspend insulin delivery for two hours when the sensor glucose reaches a set threshold. Under some conditions of use the pump can suspend again resulting in very limited insulin delivery. Prolonged suspension can increase the risk of serious hyperglycemia, ketosis, and ketoacidosis. Before using the Threshold Suspend feature, it is important to read the Threshold Suspend information in the MiniMed 530G System User Guide and discuss proper use of the Threshold Suspend feature with your healthcare provider.

Please visit www.medtronicdiabetes.com/importantsafetyinformation for more details.

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